Dynamics of head movement trajectories: Main sequence relationship

Zangemeister, Wolfgang H.; Jones, Ashby; Stark, Lawrence

doi:10.1016/0014-4886(81)90072-8

Cited by 206 publications

(41 citation statements)

References 25 publications

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“…The commands sent to the eye are tightly linked to eye velocity, resulting from the fact that the eye is virtually inertia-less and is dominated by viscous elements (Robinson, 1981). However, the head is dominated by its high inertial component and thus the agonist commands sent to it are tightly linked to the acceleration phase of its movement (Zangemeister et al, 1981). This is followed by antagonist commands applied by the opposing muscle to decelerate the head movement (Hannaford et al, 1986).…”

Section: Discussionmentioning

confidence: 99%

Optimal Control of Gaze Shifts

Kardamakis

Moschovakis²

2009

Journal of Neuroscience

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To explore the visible world, human beings and other primates often rely on gaze shifts. These are coordinated movements of the eyes and head characterized by stereotypical metrics and kinematics. It is possible to determine the rules that the effectors must obey to execute them rapidly and accurately and the neural commands needed to implement these rules with the help of optimal control theory. In this study, we demonstrate that head-fixed saccades and head-free gaze shifts obey a simple physical principle, "the minimum effort rule." By direct comparison with existing models of the neural control of gaze shifts, we conclude that the neural circuitry that implements the minimum effort rule is one that uses inhibitory cross talk between independent eye and head controllers.

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Section: Discussionmentioning

confidence: 99%

Optimal Control of Gaze Shifts

Kardamakis

Moschovakis²

2009

Journal of Neuroscience

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“…Although a gaze shift can be realized by different combinations of eye-head movements, these movements are empirically found to be stereotyped in terms of relative eye and head contributions (Guitton and Volle, 1987;Freedman and Sparks, 1997), as well as velocity profiles of eye (Collewijn et al, 1988) and head (Zangemeister et al, 1981;Freedman and Sparks, 2000). The fact that the brain singles out one eye-head movement among many possibilities suggests an underlying optimization.…”

Section: Introductionmentioning

confidence: 99%

Optimal Control of Natural Eye-Head Movements Minimizes the Impact of Noise

Sağlam

Lehnen²,

Glasauer³

2011

J. Neurosci.

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When shifting gaze to foveate a new target, humans mostly choose a unique set of eye and head movements from an infinite number of possible combinations. This stereotypy suggests that a general principle governs the movement choice. Here, we show that minimizing the impact of uncertainty, i.e., noise affecting motor performance, can account for the choice of combined eye-head movements. This optimization criterion predicts all major features of natural eye-head movements-including the part where gaze is already on target and the eye counter-rotates-such as movement durations, relative eye-head contributions, velocity profiles, and the dependency of gaze shifts on initial eye position. As a critical test of this principle, we show that it also correctly predicts changes in eye and head movement imposed by an experimental increase in the head moment of inertia. This suggests that minimizing the impact of noise is a simple and powerful principle that explains the choice of a unique set of movement profiles and segment coordination in goal-directed action.

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“…Fuller (1992), based on studies using targets at 20 and 40 degree eccentricities identified subjects as "head movers" and "non head movers" and came to the conclusion that, "Individuals have an innate propensity to move their heads ..." p 156. Zangemeister, Jones, and Stark (1981) came to the conclusion that: "In addition, the head movement depends a good deal on subject intent; this, in turn, is influenced by his skill and experience and the nature of his perception of instructions given during the experiment." p 86.…”

Section: Introductionmentioning

confidence: 99%

Eye and Head Movements in the Acquisition of Visual Information

Stern¹,

Brown

Wang

et al. 2005

PSYCHOLOGIA -An International Journal of Psychological Sciences

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Much of the literature dealing with the measurement of eye movements is restricted to data collected under conditions where the head is "stabilized". Since in the "real world" such restrictions cannot readily be imposed on operators, we here review the literature dealing with the use of head movements in the acquisition and processing of visually presented information. Task difficulty is associated with an increase in the likelihood of using head movements to acquire visually presented information. Such head movements have been described with visual information subtending as little as 5-10 degrees of arc. The present study, requiring subjects to identify and process information presented at 10 degree eccentricity, determined that such head movements do occur. Head movements were not measured directly but inferred from differences in eye movement amplitude as measured with electrooculography, and gaze shift measured with video camera technology. We raise the issue of generalizability of results obtained under conditions where the head is "stabilized" to conditions where it is free to move.

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Dynamics of head movement trajectories: Main sequence relationship

Cited by 206 publications

References 25 publications

Optimal Control of Gaze Shifts

Optimal Control of Gaze Shifts

Optimal Control of Natural Eye-Head Movements Minimizes the Impact of Noise

Eye and Head Movements in the Acquisition of Visual Information

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